JP7012417B2 - Aseptic filling bottle - Google Patents

Description

The present invention relates to an aseptic filling bottle comprising a mouth, shoulders, body and bottom.

As a method for filling a plastic bottle with a liquid, there is an aseptic filling method in which the liquid is filled in the bottle in an aseptic state. According to this aseptic filling method, the plastic bottle is not exposed to high temperature. Therefore, the plastic bottle filled by the aseptic filling method (hereinafter, referred to as an aseptic filling bottle) may have low heat resistance, and therefore can be a thin and lightweight bottle.

However, if the bottle is made thinner and lighter, there is a problem that the strength is lowered by that amount. Therefore, for example, when the inside is filled with carbonated drinking water, the internal pressure may increase due to the removal of carbonic acid inside, and the bottom may be inverted (buckling). When buckling occurs, the bottle cannot stand on its own and cannot be distributed as a product. To solve this problem, Japanese Patent Application Laid-Open No. 2012-140156 (Patent Document 1) provides a bottle that suppresses buckling at the bottom by providing a dome-shaped recess that retracts inward at the center of the central portion at the bottom. Proposed.

Japanese Unexamined Patent Publication No. 2012-140156

Plastic bottles filled with contents are not only stored at room temperature or refrigerated, but may also be stored frozen in order to freeze and store the contents. However, in the case of freezing storage, there is a problem that the contents expand due to freezing, which causes buckling at the bottom. This problem is remarkable in an aseptic filling bottle that does not consider the expansion and contraction of the content liquid and the internal air in the design, and in the worst case, not only the buckling but also the bottle may burst.

The force applied to the bottom due to the expansion of the contents is generally larger than the force applied to the bottom due to the increase in internal pressure due to the loss of carbonic acid, and the bottle of Patent Document 1 is strong enough to suppress buckling when filled with carbonated drinking water. However, the strength did not reach a level that could suppress buckling due to expansion of the contents during frozen storage. Further, when the structure as in Patent Document 1 is adopted, there is a problem that it is difficult to design and reduce the weight. As described above, the aseptic filling bottle has not been actively used for freezing storage due to the problem of strength.

Therefore, it is desired to realize an aseptic filling bottle that can suppress the buckling of the bottom even by freezing storage.

The aseptic filling bottle according to the present invention is
An aseptic filling bottle with a mouth, shoulders, body and bottom.
The shoulder portion is a portion whose diameter gradually increases toward the bottom surface continuous with the mouth portion.
The body portion is a tubular portion continuous with the shoulder portion, and is a tubular portion.
The bottom portion is a portion where the peripheral surface of the bottle body portion gradually reduces in diameter toward the bottom surface, and is a portion closest to the bottom surface.
The bottom portion includes a grounding portion that is grounded to the installation surface, a central portion that rushes into the inside of the bottle as it goes radially inward from the grounding portion, and a central portion that is provided at the central portion of the central portion. It has a dome part that plunges into the inside of the bottle,
The height of the outer surface of the bottle entering the inside of the bottle at the dome-side peripheral edge of the central portion is formed to be higher than half the height from the ground contact portion to the boundary between the body portion and the bottom portion.
The position of the boundary is a position in the height direction in which the bottle body portion begins to shrink in diameter toward the bottom surface, and is the position closest to the bottom surface .
The weight ratio of the bottom to the total weight of the bottle is 0.146 or more and less than 0.20.

The inventor does not make the central part into a dome shape in which only the center is pushed into the inside of the bottle, but keeps the dome-shaped shape of the center and the entire central part from the peripheral portion to the ground contact portion of the dome-shaped portion. It was also found that the strength of the bottom of the bottle can be further strengthened by adopting a configuration in which the bottle rushes into the inside of the bottle as it goes inward in the radial direction. Then, the inventor further makes the maximum intrusion height of the central portion, that is, the intrusion height of the dome-shaped portion into the inside of the bottle higher than half the height of the bottom portion, thereby increasing the strength. It was also found that the effect of strengthening the dome can be further enhanced.

According to this configuration, the structure found by the inventor, that is, the central portion has a shape that plunges into the inside of the bottle as it goes radially inward from the ground contact portion, and at the same time, it enters the inside of the bottle at the peripheral portion of the dome-shaped portion. Since the plunge height is formed to be higher than half the height of the bottom (that is, the height to the boundary between the body and the bottom), the strength of the bottom can be effectively increased. This can effectively suppress the buckling of the bottom in the frozen storage.

Hereinafter, a preferred embodiment of the aseptic filling bottle according to the present invention will be described. However, the scope of the present invention is not limited by the preferred embodiments described below.

As one embodiment, it is preferable that the central portion is formed in an arc shape.

According to this configuration, by forming the shape of the central portion that rushes into the inside of the bottle in an arc shape, the central portion is formed in a straight line from the ground contact portion to the peripheral portion on the dome portion side, whereas the central portion is applied to the central portion. Since the pressure is made uniform, the strength of the bottom can be increased more effectively. This makes it possible to more effectively suppress the buckling of the bottom in the frozen storage.

As one embodiment, it is preferable that the concave groove portion is formed radially from the central portion.

According to this configuration, the strength of the bottom portion can be reinforced by the concave groove portion.

As one embodiment, it is preferable that the concave groove portion extends from the dome portion to the peripheral edge portion radially outer from the ground contact portion.

According to this configuration, since the concave groove portion for reinforcing the strength of the bottom portion is formed long from the dome portion to the peripheral portion, the strength of the bottom portion can be further reinforced.

As one embodiment, it is preferable that the depth of the concave groove portion at the ground contact portion is 2.5 mm to 5.0 mm.

By setting the depth of the concave groove portion at the ground contact portion to the depth in this configuration, the strength of the bottom portion can be further reinforced.

As one aspect, it is preferable that the body portion is formed with at least one concave rib that orbits the peripheral surface thereof.

According to this configuration, the volume expansion of the contents in the freezing storage can be absorbed to some extent by the concave rib provided on the body portion, so that the force applied to the appropriate part due to the volume expansion can be reduced and the freezing storage can be performed. The buckling of the bottom can be effectively suppressed.

Front view of aseptic filling bottle Bottom view of the bottom of an aseptic filling bottle Perspective view of the bottom of an aseptic filling bottle IV-IV sectional view in FIG. VV cross-sectional view in FIG.

An embodiment of the aseptic filling bottle according to the present invention will be described with reference to the drawings. The aseptic filling bottle 1 according to the present embodiment includes a mouth portion 2, a shoulder portion 4, a body portion 5, and a bottom portion 6. The bottom portion 6 has a grounding portion 10 that is grounded to the installation surface, a central portion 12 that rushes into the inside of the main body from the grounding portion 10 toward the central portion of the bottom portion 6, and a central portion provided at the central portion of the central portion 12. It has a dome portion 13 that pierces the inside of the bottle further than the portion 12. The central portion 12 has a state in which the intrusion height D1 to the inside of the bottle at the dome portion side peripheral portion 12a of the central portion 12 is higher than half the height D2 of the height from the ground contact portion 10 to the boundary between the body portion 5 and the bottom portion 6. Is formed of. This can effectively suppress the buckling of the bottom in the frozen storage. Hereinafter, the aseptic filling bottle 1 according to the present embodiment will be described in detail.

As shown in FIG. 1, the aseptic filling bottle (hereinafter, simply referred to as a bottle) 1 according to the present embodiment includes a mouth portion 2 as a liquid spout and a bottle body portion 3 for filling the liquid. The bottle body 3 includes a shoulder 4, a body 5, and a bottom 6. The shoulder portion 4 is a portion whose diameter gradually increases toward the bottom surface continuous with the mouth portion 2, and has a shape in which polygonal panels having various shapes are combined. The body portion 4 is a tubular portion continuous with the shoulder portion 3. The bottom portion 5 is a portion of the bottle main body portion 3 in which the peripheral surface of the bottle main body portion 3 gradually reduces in diameter toward the bottom surface. That is, in the present embodiment, the position of the boundary between the body portion 5 and the bottom portion 6 is the position in the height direction in which the bottle body portion 3 begins to shrink in diameter toward the bottom surface.

Here, the bottle 1 according to the present embodiment is a bottle used for an aseptic filling method in which a liquid is filled in a bottle in an aseptic state. According to the aseptic filling method, the plastic bottle does not need to be exposed to high temperature, so that the bottle 1 may have low heat resistance, and therefore the bottle 1 is thin and lightweight. The bottle 1 can be integrally molded by a stretching molding method such as biaxial stretching blow molding using a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material.

As will be described later, the bottle 1 according to the present embodiment is configured to withstand the expansion of the filling when the filled liquid is frozen. Therefore, as the content to be filled in the bottle 1, for example, minerals. Non-carbonated beverages that may be frozen and stored, such as water, tea, soft drinks, or fruit juices, are particularly preferred. However, it can also be suitably used for foods such as carbonated drinks and sauces.

The body portion 5 is composed of a straight body portion 5a as an upper part of the body portion, a constricted portion 5b as a lower part of the body portion, and a cushion portion 5c. A plurality of concave ribs 7 that circulate around the peripheral surface of the straight body portion 5 are formed. The concave rib 7 has a concave shape inward in the radial direction (direction toward the central axis X of the bottle 1 and along the horizontal direction), and the width and depth of each concave rib 7 are substantially the entire circumference. It is formed constantly. These concave ribs 7 function as reinforcing ribs for reinforcing the lateral strength of the bottle 1, and also function as a portion for absorbing the volume expansion of the content liquid during frozen storage by stretching the bottle 1 in the vertically upward direction.

The constricted portion 5b is a portion configured so that the consumer can easily grip the bottle 1. The constricted portion 5b has a shape in which polygonal panels having various shapes are combined in a front view, and the diameter of the constricted portion 5b is gradually reduced toward the central position in the vertical direction of the constricted portion 5b.

The cushion portion 5c has a V-shaped recess 8 as a concave rib 7 and two small recesses 9a and 9b, respectively, and has a three-stage spring structure. As a result, it can be elastically deformed in the vertical direction. Therefore, even if a load is applied to the bottle 1 from the vertical direction, the cushion portion 5c can be elastically deformed to absorb the load, and buckling of the bottle 1 can be prevented. Further, the V-shaped recesses 8 and the small recesses 9a and 9b also function as sites for absorbing the volume expansion of the content liquid during frozen storage due to deformation. Further, the lower small recess 9b also serves as a boundary between the body portion 5 and the bottom portion 6.

The body portion 5 has the above-described configuration, and in the body portion 5, the concave ribs 7 are formed in the upper part (straight body portion 5a) and the lower part (neck portion 5b and cushion portion 5c) of the body portion, respectively. It has become. One concave rib 7 may be formed at least at any position of the body portion 5, and preferably two or more concave ribs 7 may be formed on the body portion 5. More preferably, at least one is formed in the lower part of the body and a plurality of pieces are formed in the upper part of the body. In this embodiment, a total of six concave ribs 7 are formed in the straight body 5a as the upper part of the body. Is formed. If at least one bottle is formed in each of the lower part of the body and the upper part of the body, the volume expansion of the internal solution during frozen storage can be easily extended in the vertically upward direction of the bottle 1, so that the bottle 1 stands straight without tilting. It can be done, and there is no deformation or rupture of the bottle. Further, as shown in FIG. 1, the concave rib 7 may have a concave shape inward in the radial direction, and the concave shape may be formed over the entire circumference. The straight body portion 5a (upper part of the body part) is a place where a label (not shown) on which a product name or the like is written is wound, and the concave rib 7 is covered by the label. By focusing on the formation, the appearance is not spoiled.

As shown in FIGS. 1 to 3, the bottom portion 6 has an annular grounding portion 10 that is grounded to an installation surface such as a desk, and further, a peripheral portion 11 that is a portion radially outside the grounding portion 10. It has a central portion 12 which is a portion radially inside the ground contact portion 10, and a dome portion 13 provided at the central portion of the central portion 12 and which is further inside the bottle than the central portion 12. The central portion 12 is formed in a shape that plunges into the inside of the bottle 1 (upper side in FIG. 1) toward the inside in the radial direction from the ground contact portion 10, and is formed in an arc shape from the ground contact portion 10 to the dome portion 13. Further, as shown in FIG. 4, in the central portion 12, the intrusion height D1 into the inside of the bottle at the dome portion side peripheral portion 12a of the central portion 12 extends from the ground contact portion 10 to the boundary 6a between the body portion 5 and the bottom portion 6. It is formed in a state where it is higher than half the height of D2. Further, the dome portion 13 is formed in a trapezoidal shape in a vertical cross-sectional view.

A plurality of (8 in this embodiment) concave groove portions 14 extending from the dome portion 13 to the peripheral portion 11 are formed on the bottom portion 6 at equal intervals radially from the dome portion 13. The concave groove portion 14 reinforces the strength of the bottom portion 6. The concave groove portion 14 divides the ground contact portion 10, the peripheral portion 11, and the central portion 12 into a plurality of parts (in the present embodiment, eight pieces) in the circumferential direction (direction around the central axis X of the bottle 1). .. As shown in FIG. 5, the height position of the end portion 14a on the peripheral edge portion 11 side of each concave groove portion 14 is substantially the same as the height position of the top portion 13b of the dome portion 13. Further, it is preferable that the concave groove portion 14 has a depth of 2.5 mm to 5.0 mm in the ground contact portion 10. If it is 2.5 mm or less, it is difficult to obtain sufficient reinforcing strength, and if it is 5.0 mm or more, it may become too deep and spoil the appearance of the bottle 1 or it may be necessary to change the design of other parts. ..

In this way, in the bottle 1, not only the dome portion 13 is formed in the central portion of the bottom portion 6, but also the entire central portion 12 from the dome portion 13 to the ground contact portion 10 rushes into the inside of the bottle as it goes inward in the radial direction. The structure should be such that the intrusion height of the dome portion side peripheral portion 13a into the bottle is higher than half the height of the bottom portion 6, and an arc shape is formed from the ground contact portion 10 to the dome portion side peripheral edge portion 13. By forming, the strength of the bottom 6 is effectively increased. Further, the strength of the bottom portion 6 is reinforced by the concave groove portion 14 extending from the dome portion 13 to the peripheral portion 11. As a result, the strength capable of suppressing the buckling of the bottom portion 6 due to the volume expansion of the contents due to the frozen storage is secured.

Next, the weight and volume of the bottle 1 will be described. First, the bottom portion 6 is formed so that the weight ratio of the bottom portion 6 to the total weight of the bottle is 0.12 or more. That is, by increasing the weight ratio of the bottom portion 6, the wall thickness of the bottom portion 6 is increased intensively, and the strength of the bottom portion 6 can be intensively enhanced in the entire bottle. As a result, the strength of the bottom 6 can be increased to the extent that buckling of the bottom 6 in frozen storage can be suppressed. Table 1 below shows the relationship between the weight ratio of the bottom to the total weight of the bottle (in Table 1, bottom / whole) and the presence or absence of bursting / deformation in frozen storage (x for yes, o for no).

As is clear from Table 1, for bottles in which the weight ratio of the bottom to the total weight of the bottle is 0.12 or more, more preferably 0.14 or more, there is no burst or deformation in frozen storage, and the bottle is less than the weight ratio. Is supposed to explode and deform in frozen storage. However, if the weight ratio of the bottom to the total weight of the bottle is 0.20 or more, the wall thickness of parts such as the body other than the bottom becomes thin, and the bottle may burst or deform during blow molding or freezing storage. ..

The volume of the bottle 1 is not particularly limited, and can be about 200 ml (milliliter) to 2 liter (liter) that are generally distributed. In the present embodiment, the bottle 1 is formed to have a volume for filling 550 ml of liquid, and specifically, the full injection capacity (volume when filling the mouth 2 with liquid) is 577 ml.

Regarding the relationship between the weight and volume of bottle 1, it is said that the ratio of the weight (g) of bottle 1 to the full filling capacity of bottle 1 is 0.017 to 0.040 (g / ml). It is suitable, and in this embodiment, the weight is 14.9 g, and the ratio of the weight to the full filling capacity is about 0.26. That is, when the ratio of the total weight to the full filling capacity (capacity when filling the liquid to the full mouth) exceeds 0.040 (g / ml) in the aseptic filling bottle 1, what is a thin and lightweight bottle? No, the need to strengthen the strength of the bottom 6 by making the weight ratio of the bottom to the total weight 0.12 or more diminishes. On the other hand, when the ratio of the total weight to the full volume is less than 0.017 (g / ml), even if the weight ratio of the bottom to the total weight is 0.12 or more, the meat of the body and other parts other than the bottom. The thickness becomes too thin, and it becomes impossible to secure enough strength to prevent rupture due to volume expansion.

Further, when the bottle 1 is filled with the content liquid to form a filling bottle, the volume ratio of the space not filled with the content liquid (that is, the margin portion where the content is not filled) with respect to the full filling capacity is 0.12 or less. Preferably, in the present embodiment, the volume of the space not filled with the liquid is assumed to be 27 ml (= full filling capacity 577 ml-550 ml), and the volume ratio of the space not filled with the liquid to the full filling capacity is approximately 0.05. There is. That is, when the storage is planned to be frozen, the space not filled with the content liquid is enlarged in consideration of the volume expansion of the content liquid to absorb the volume expansion portion. On the other hand, when the bottle 1 according to the present embodiment in which the strength of the bottom portion 6 is enhanced is filled with the content liquid, it is necessary to increase the space not filled with the content liquid in order to suppress the buckling of the bottom portion 6. The bottle 1 according to the present embodiment is suitable when the content liquid is sufficiently filled with respect to the full filling capacity. Therefore, assuming that the volume ratio of the space not filled with the content liquid to the full filling capacity is 0.12 or less and the filling bottle is sufficiently filled with the content liquid to the full filling capacity, the bottle according to the present embodiment. 1 can be preferably used.

[Other embodiments]
Finally, other embodiments of the aseptic filling bottle according to the present invention will be described. The configurations disclosed in each of the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction.

(1) In the above embodiment, an example in which the body portion 5 is composed of a straight body portion 5a, a constricted portion 5b, and a cushion portion 5c has been described. However, embodiments of the present invention are not limited to this. For example, the body portion 5 may be formed only from the straight body portion 5a, or the body portion 5 may be formed from the straight body portion 5a and the constricted portion 5b or the cushion portion 5c.

(2) In the above embodiment, a concave small groove portion smaller than the concave groove portion 14 may be formed between the concave groove portions 14 and further from the ground contact portion 10 to the peripheral edge portion 11. This can further reinforce the strength of the bottom.

(3) It should be understood that with respect to other configurations, the embodiments disclosed herein are exemplary in all respects and the scope of the invention is not limited thereto. Those skilled in the art will be able to easily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Therefore, another embodiment modified without departing from the spirit of the present invention is naturally included in the scope of the present invention.

The present invention can be used, for example, in a plastic bottle for filling a content liquid by an aseptic filling method.

1 Aseptic filling bottle 2 Mouth 4 Shoulder 5 Body 6 Bottom 7 Concave rib 8 V-shaped recess (concave rib)
9a, 9b Small recess (concave rib)
11 Peripheral part 10 Grounding part 12 Central part 13 Dome part 14 Concave groove part D1 Intrusion height to the inside of the bottle at the dome part side peripheral part of the central part D2 Half the height from the grounding part to the boundary between the body and the bottom height

Claims (6)

An aseptic filling bottle with a mouth, shoulders, body and bottom.
The shoulder portion is a portion whose diameter gradually increases toward the bottom surface continuous with the mouth portion.
The body portion is a tubular portion continuous with the shoulder portion, and is a tubular portion.
The bottom portion is a portion where the peripheral surface of the bottle body portion gradually reduces in diameter toward the bottom surface, and is a portion closest to the bottom surface.
The bottom portion includes a grounding portion that is grounded to the installation surface, a central portion that rushes into the inside of the bottle as it goes radially inward from the grounding portion, and a central portion that is provided at the central portion of the central portion. It has a dome part that plunges into the inside of the bottle,
The height of the outer surface of the bottle entering the inside of the bottle at the dome-side peripheral edge of the central portion is formed to be higher than half the height from the ground contact portion to the boundary between the body portion and the bottom portion.
The position of the boundary is a position in the height direction in which the bottle body portion begins to shrink in diameter toward the bottom surface, and is the position closest to the bottom surface .
An aseptic filling bottle in which the weight ratio of the bottom to the total weight of the bottle is 0.146 or more and less than 0.20. The aseptic filling bottle according to claim 1, wherein the central portion is formed in an arc shape. The aseptic filling bottle according to claim 1 or 2, wherein the concave groove portion is formed radially from the dome portion. The aseptic filling bottle according to claim 3, wherein the concave groove portion extends from the dome portion to a peripheral edge portion radially outer from the ground contact portion. The aseptic filling bottle according to claim 3 or 4, wherein the depth of the ground contact portion of the concave groove portion is 2.5 mm to 5.0 mm. The aseptic filling bottle according to any one of claims 1 to 5, wherein the body portion is formed with at least one concave rib that orbits the peripheral surface thereof.

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